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[RFC,bpf-next,10/14] libbpf: add likely/unlikely macros

Message ID 20250318143318.656785-11-aspsk@isovalent.com (mailing list archive)
State RFC
Delegated to: BPF
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Commit Message

Anton Protopopov March 18, 2025, 2:33 p.m. UTC 
A few selftests and, more importantly, a consequent changes to the
bpf_helpers.h file use likely/unlikely macros. So define them here.

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
---
 tools/lib/bpf/bpf_helpers.h | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 686824b8b413..a50773d4616e 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -15,6 +15,14 @@ 
 #define __array(name, val) typeof(val) *name[]
 #define __ulong(name, val) enum { ___bpf_concat(__unique_value, __COUNTER__) = val } name
 
+#ifndef likely
+#define likely(x)      (__builtin_expect(!!(x), 1))
+#endif
+
+#ifndef unlikely
+#define unlikely(x)    (__builtin_expect(!!(x), 0))
+#endif
+
 /*
  * Helper macro to place programs, maps, license in
  * different sections in elf_bpf file. Section names